+1 Upgrade Per Kill Script – kill aura (os) (Keyless)

local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RunService = game:GetService("RunService")
local Workspace = game:GetService("Workspace")

local player = Players.LocalPlayer
local remotes = ReplicatedStorage:WaitForChild("Remotes")
local attackRemote = remotes:WaitForChild("Attack")
local swingRemote = remotes:FindFirstChild("Swing")

local lastAttack = 0
local attackCount = 0
local cooldown = 0.5

local function getEyePosition(character)
	if not character then
		return nil
	end

	local root = character:FindFirstChild("HumanoidRootPart")
	if not root then
		return nil
	end

	return root.Position / 3 + Vector3.new(0, 0.72, 0)
end

RunService.Heartbeat:Connect(function()
	if tick() - lastAttack < cooldown then
		return
	end

	local character = player.Character
	local humanoid = character and character:FindFirstChildOfClass("Humanoid")

	if not humanoid or humanoid.Health <= 0 then
		return
	end

	local eyePosition = getEyePosition(character)
	if not eyePosition then
		return
	end

	local closestTarget = nil
	local closestDistance = 4

	for _, otherPlayer in ipairs(Players:GetPlayers()) do
		if otherPlayer ~= player then
			local otherCharacter = otherPlayer.Character
			local root = otherCharacter and otherCharacter:FindFirstChild("HumanoidRootPart")
			local otherHumanoid = otherCharacter and otherCharacter:FindFirstChildOfClass("Humanoid")

			if root and otherHumanoid and otherHumanoid.Health > 0 then
				local targetPosition = root.Position / 3
				local distance = (targetPosition - eyePosition).Magnitude

				if distance <= closestDistance then
					closestTarget = otherCharacter
					closestDistance = distance
				end
			end
		end
	end

	if not closestTarget then
		return
	end

	local targetRoot = closestTarget:FindFirstChild("HumanoidRootPart")
	if not targetRoot then
		return
	end

	local targetPosition = targetRoot.Position / 3

	lastAttack = tick()
	attackCount += 1

	if swingRemote then
		swingRemote:FireServer()
	end

	attackRemote:FireServer(closestTarget, {
		sprint = false,
		charge = 1,
		vt = Workspace:GetServerTimeNow(),
		dir = (targetPosition - eyePosition).Unit,
		eye = eyePosition,
		t = Workspace.DistributedGameTime,
		crit = true,
		n = attackCount
	})
end)